I've been asked for a map of the ride I did yesterday. I've never used Bikely before so my apologies for the crudeness of the recreation. Unfortunately, I can't get the cue sheet thing to work. In any case, you can at least see how I got in and out of Fort Belvoir and where I was in Lorton. The rest is neighborhood meanderings in the last 15 miles to get the thing to total to 70. (An alternative would have been to ride on Hampton Road near Lorton for a few miles and turn around.)
The software says it was 77 miles but I doubt it. Another 10 percent would have done me in for sure.
Anyway, here's the Fat Toad 70 miler